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An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?
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- mv2
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1 mv2 2 -
1 m2v2 2 -
1 mv3 2
Correct Option: D
m : mass per unit length
| ∴ rate of mass leaving the the hose per sec = | = mv | |
| t |
| Rate of K.E. = | (mv)v2 = | mv3 | ||
| 2 | 2 |
